If I understand this paper correctly, it is completely consistent with the following explanation.
1. Democrats traditionally commit vote fraud in heavily Democratic districts.
2. Electronic voting machines are a new tool and they have not figured out how to manipulate them yet.
3. Fraud occurred in heavily Democratic counties in 2000 because old familiar technology was used.
4. Fraud was lessened in 2004 because electronic voting has not been coopted yet.
Incredibly they spend this much time thinking about a topic and it never crosses their mind they are walking into a trap.
My thoughts exactly.